Electrochemical sensor apparatus



FIG. 1 is a perspective view showing an electrochemical sensor apparatus of my new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a top plane view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a bottom plane view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a rear elevational view thereof; and,

FIG. 8 is a perspective view showing our new design when the strip base is separated from the apparatus body. 

The ornamental design for an electrochemical sensor apparatus, as shown and described. 